| Titre : | Bioturbation and the fate of sediment pollutants - Experimental case studies of selected infauna species (2003) |
| Auteurs : | G. T. Banta, Auteur ; O. Andersen, Auteur |
| Type de document : | Article |
| Dans : | Vie et Milieu - Life and Environment (53(4) décembre 2003) |
| Article en page(s) : | 233-248 |
| Langues: | Anglais |
| Résumé : | In this review we examine the interactions between bioturbating infauna and sediment pollutants with emphasis on what determines the fate of contaminants in bioturbated sediments. Our review is based on experimental case studies, especially of the polychaetes Arenicola marina and Nereis diversicolor. Bioturbation by infauna affects pollutants via a number of mechanisms such as particle mixing and irrigation which lead to the transport and redistribution of pollutants, through the stimulation of microbial degradation of organic contaminants by enhancing the availability of molecular O(2) in bioturbated sediments, and via their own metabolism of contaminants. A. marina is an example of an infauna species that mostly affects pollutant fate via transport, both particle mixing and especially its effective flushing of porewaters via irrigation. It also stimulates microbial processes in sediments, including the degradation of organic pollutants. N. diversicolor is an example of an infauna species that actively metabolizes organic pollutants and plays an important role on pollutant fate in that way. It also flushes dissolved components from sediments and stimulates microbial degradation, but to a lesser extent than A. marina. N. diversicolor affects the particle-associated fraction of contaminants to an even lesser extent via its biodiffusive mixing. By examining the effects of these two and other species on the fate of sediment pollutants we demonstrate that the many different mechanisms by which infauna affect pollutants interact in complicated and, at times, contradictory ways, also depending on physicochemical characteristics and the localization of sediment pollutants. This makes the overall effects on pollutant fate variable and dependent on the specific situation. We suggest that mechanistically correct models which link the fates and effects of pollutants to bioturbation transport processes provide promising tools for the prediction of the outcome of these complicated interactions. Such models are therefore of interest to both scientists studying these phenomena and to managers who need to predict the fate and effects of pollution events in bioturbated habitats. |
| En ligne : | https://wwwphp.obs-banyuls.fr/Viemilieu/index.php/volume-53-2003/53-issue-4.html |
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